LABORATORY AND PLANT: APPARATUS FOR KJELDAHL DETERMINATIONS

A steam distillation apparatus suitable for micro-Kjeldahl analysis.

Apparatus for Percoll microgravimetry determinations in experimental brain edema.

A microgravimetry apparatus is described which utilizes osmotically-balanced Percoll gradients produced by a computer-driven low pressure gradient system. A plexiglass reservoir was designed to minimize parallax artifacts while allowing repeated measurements and easy retrieval of groups of 20 samples. This system provides inert and nontoxic gradients with profile flexibility, reproducibility, a...

Laboratory Procedures, Apparatus and Improvizations

In the recent medical literature, there has been an almost uninterrupted flow of papers describing new methods of desiccation, or introducing some modifications in old methods. It is not the purpose of this paper to describe a new method of desiccation, but to stress certain technical details and amplify certain procedures which it is hoped will be found useful in any method finally selected by...

Entangled photon apparatus for the undergraduate laboratory

We present detailed instructions for constructing and operating an apparatus to produce and detect polarization-entangled photons. The source operates by type I spontaneous parametric downconversion in a two-crystal geometry. Photons are detected in coincidence by single-photon counting modules and show strong angular and polarization correlations. We observe more than 100 entangled photon pair...

Calibration of laboratory aeration apparatus.

Aeration of some sort is frequently provided during laboratory cultivation of bacteria. Since metabolic responses and the nature of fermentation products may depend upon the amount of available oxygen (Pirt, 1957), it is important to have some adequate measure of this variable. Finn (1954) has pointed out that gassing rates alone are without significance; it is necessary to determine the rate a...